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Leucovorin Side Effects, and Drug Interactions - Leucovorin
SIDE EFFECTS
Allergic sensitization, including anaphylactoid reactions and urticaria, has been reported following the administration of both oral and parenteral leucovorin.
DRUG INTERACTIONS
Folic acid in large amounts may counteract the antiepileptic effect of phenobarbital, phenytoin and primidone, and increase the frequency of seizures in susceptible children.
Preliminary animal and human studies have shown that small quantities of systemically administered leucovorin enter the CSF primarily as 5methyltetrahydrofolate and, in humans, remain 13 orders of magnitude lower than the usual methotrexate concentrations following intrathecal administration. However, high doses of leucovorin may reduce the efficacy of intrathecally administered methotrexate.
Leucovorin may enhance the toxicity of fluorouracil (see WARNINGS).
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